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INCOME TAXES (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2013 State | Sep. 03, 2013 State
Federal |  |  |  |  |  |  |
Current | $ (4,173,000) |  | $ (3,835,000) |  | $ 4,724,000 |  |
Deferred | 19,925,000 |  | 26,365,000 |  | 20,602,000 |  |
Investment tax credits | (213,000) |  | (213,000) |  | (213,000) |  |
State and local |  |  |  |  |  |  |
Current | (301,000) |  | (430,000) |  | 573,000 |  |
Deferred | 2,340,000 |  | 4,402,000 |  | 3,496,000 |  |
Total Income Tax Expense | 17,578,000 |  | 26,289,000 |  | 29,182,000 |  |
Effective income tax rate variance from federal statutory rate [Abstract] |  |  |  |  |  |  |
Federal income tax statutory rate | 35.00% |  | 35.00% |  | 35.00% |  |
State and local income taxes, net of federal income tax benefits | 3.50% |  | 2.90% |  | 2.80% |  |
Certain expenses capitalized on books and deducted on tax return | (9.70%) |  | (6.90%) |  | (5.00%) |  |
Taxes related to prior years | (1.60%) |  | (0.80%) |  | (0.70%) |  |
Other items – net | (2.20%) |  | (0.60%) |  | (0.70%) |  |
Effective income tax rate | 25.00% |  | 29.60% |  | 31.40% |  |
Deferred tax assets: |  |  |  |  |  |  |
Reserves not currently deductible | 13,933,000 |  | 16,400,000 |  |  |  |
Pension and other postretirement benefits | 71,367,000 |  | 73,480,000 |  |  |  |
Unamortized investment tax credits | 1,799,000 |  | 1,955,000 |  |  |  |
Other | 12,522,000 | [1] | 18,224,000 | [1] |  |  |
Total deferred tax assets | 99,621,000 |  | 110,059,000 |  |  |  |
Deferred tax liabilities: |  |  |  |  |  |  |
Relating to property | 341,975,000 |  | 303,474,000 |  |  |  |
Regulatory pension and other postretirement benefits | 124,871,000 |  | 121,554,000 |  |  |  |
Deferred gas costs | 7,112,000 |  | 20,652,000 |  |  |  |
Other | 5,789,000 |  | 26,563,000 |  |  |  |
Total deferred tax liabilities | 479,747,000 |  | 472,243,000 |  |  |  |
Total deferred tax liabilities | 380,126,000 |  | 362,184,000 |  |  |  |
Net deferred tax liability - current | (1,012,000) | [1] | (6,675,000) | [1] |  |  |
Net deferred tax liability - non-current | 379,114,000 | [1] | 355,509,000 | [1] |  |  |
Unrecognized tax benefits [Roll Forward] |  |  |  |  |  |  |
Unrecognized tax benefits, beginning of year | 5,810,000 |  | 5,596,000 |  |  |  |
Increases related to prior year tax positions | 145,000 |  | 78,000 |  |  |  |
Increases related to tax positions taken in current year | 1,450,000 |  | 547,000 |  |  |  |
Reductions due to lapse of applicable statute of limitations | (5,018,000) |  | (411,000) |  |  |  |
Unrecognized tax benefits, end of year | 2,387,000 |  | 5,810,000 |  | 5,596,000 |  |
Tax credits included in net deferred tax liability |  |  |  |  |  |  | 7,100,000
Tax credits classified as current |  |  |  |  |  | 4,700,000 |
Tax credits classified as noncurrent |  |  |  |  |  | 2,400,000 |
Unrecognized tax benefits affect on the Company's effective tax rate | 1,900,000 |  | 1,400,000 |  |  |  |
Interest accrued associated with uncertain tax positions | 100,000 |  | 600,000 |  |  |  |
Interest expense accrued during fiscal year | 100,000 |  | 200,000 |  | 200,000 |  |
Reversal of accrued penalties | $ 600,000 |  |  |  |  |  |
[1] | The Company periodically invests in tax credits. As of September 30, 2013, $7.1 million of state tax credits are included in Other and Net deferred tax liability. $4.7 million of state tax credits were classified as current. $2.4 million of state tax credits were classified as non-current.

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